Also not qualified to pass judgement but I have noticed a fine twist vs. a course twist. The H Lefever I have has a finer twist than the Baker 1897 hammergun twist. The Lefever barrels are much lighter (1905 vintage) and since the gun has seen much use but not abuse (finish gone but barrels perfect) I'll guess it has seen a lot of smokeless in it's life. Just a comment.

happy shooting,